package main

import "fmt"

func main() {
	dismantlingAction("abbccdeff")
}
func dismantlingAction(arr string) byte {
	var list [26]int
	length := len(arr)
	for i := 0; i < length; i++ {
		fmt.Println(arr[i])
		list[arr[i]-'a']++
	}
	for i := 0; i < length; i++ {
		if list[arr[i]-'a'] == 1 {
			return arr[i]
		}
	}
	return ' '
}
